Ecomask Spray beneficial nematodes contain the species Steinernema carpocapsae, a native naturally occurring insect parasitic nematode. The nematodes in Ecomask seek out pest insects, enter their bodies and release symbiotic bacteria that kill the pest. Ecomask is especially adept at killing flea larvae in yards. BioLogic’s nematodes have not been modified in any way and are supplied in a moist inert carrier. Treating with Ecomask is easy! Apply with either a hose end sprayer, watering can or BioLogic’s Nema-jet sprayer. Ecomask controls a wide variety of insect pests, but is safe for people, pets, and plants. Ecomask is also compatible with other beneficials like earthworms, ladybugs, and praying mantids. Ecomask controls numerous pests including: armyworms, billbugs, fleas, iris borers, shore flies, and sod webworms. Refrigerate nematodes upon arrival and until use. Treats up to 850 square feet and is safe for people, pets, and plants!